ION POTENTIAL DIAGRAMS FOR ELECTROCHROMIC DEVICES

Ion potential diagrams can facilitate the description of systems in wh ich ionic species are mobile. They depict qualitatively the spatial de pendence of the potential energy for mobile ions, somewhat akin to ban d diagrams for electrons. We construct ion potential diagrams for the mixed conducting (oxide), optically active electrodes of five-layer el ectrochromic devices, based on reversible Li+ intercalation. These ser ve to analyze stability problems that arise in these systems. We then use them as building blocks to arrive at ion diagrams for complete dev ices. This allows analyses of (dis)coloration kinetics.